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A high-temperature-resistant, heat-insulating, and wave-transmitting ceramic-based composite material and its preparation method

A composite material and high-temperature-resistant technology, which is applied to ceramic products, other household utensils, household utensils, etc., can solve the problems of non-oxidation resistance and low heat-resistant temperature, and achieve low dielectric constant, reduced production energy consumption, and low thermal conductivity. rate effect

Active Publication Date: 2021-01-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low heat-resistant temperature and non-oxidation resistance of the existing material system, the present invention selects porous mullite containing needle-like whiskers as the matrix, and realizes the improvement of heat-resistant temperature and The purpose of reducing thermal conductivity, and has good microwave dielectric properties, and realizes the integration of high temperature resistance / heat insulation / wave transmission functions

Method used

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  • A high-temperature-resistant, heat-insulating, and wave-transmitting ceramic-based composite material and its preparation method
  • A high-temperature-resistant, heat-insulating, and wave-transmitting ceramic-based composite material and its preparation method
  • A high-temperature-resistant, heat-insulating, and wave-transmitting ceramic-based composite material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] This embodiment provides a method for preparing a high-temperature-resistant, heat-insulating, and wave-transmitting ceramic matrix composite material, which is characterized in that it includes the following steps:

[0033] The first step: put kaolin, alumina, and industrial aluminum sol with a mass of 100g, 52g, and 154g respectively in a mixing tank, and simultaneously add mineralizers with a mass of 7.5g and 5g of anhydrous aluminum fluoride and a mass of 5g Molybdenum trioxide as a sintering aid, and then add 400g of alumina balls and 150ml of absolute ethanol as grinding medium, after continuous mixing for 24 hours, dry in an oven at 60°C and sieve to obtain mixed powder A;

[0034] The second step: put the mixed powder A and the pore-forming agent PS microspheres in the first step with a mass ratio of 1:0.5 in the mixing tank, add 200g of alumina balls and 150ml of absolute ethanol as the ball milling medium, wet Mix for 2 hours, dry in an oven at 60°C and pass t...

Embodiment 2

[0048] The difference between this example and Example 1 is that the mass ratio of the mixed powder A to the pore-forming agent PS microspheres in the second step is 1:0.35; the preparation method of the aluminum sol in the seventh step is as follows: , obtained by diluting commercially available industrial aluminum sol with a solid content of 25% to a solution with a solid content of 3%.

[0049] See image 3 ,

[0050] image 3 It is the dielectric constant and dielectric loss diagram of a high-temperature-resistant, heat-insulating, and wave-transmitting ceramic matrix composite material prepared in this example.

[0051] pass image 3 It can be seen that the average dielectric constant of a high-temperature-resistant, heat-insulating, and wave-transmitting ceramic matrix composite material prepared in this example is 2.02, and the dielectric loss tangent value is less than 5×10 -3 .

[0052] Therefore, in this embodiment, by adjusting the content of the pore-forming a...

Embodiment 3

[0054] The difference between this example and Example 1 is that the pore-forming agent in the second step is replaced by PMMA microspheres, and the mass ratio of the ceramic powder A to the pore-forming agent is 1:0.7, wherein the The average particle size of the pore-forming agent is less than 5 μm: and the third step is debinding and sintering in a muffle furnace. The process is replaced by heating up to 650 °C at a rate of 4 °C / min, holding for 2 hours, and then heating at 4 °C / min rate, the temperature was raised to 1200°C and kept for 2 hours to obtain porous mullite.

[0055] In this example, except that the type and content of the pore-forming agent are different, a composite material with lower thermal conductivity (0.11 W / m / K) is obtained by adopting a low sintering temperature.

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Abstract

The invention provides a high temperature-resistant, heat-insulation and wave-permeable ceramic-based composite material and a preparation method thereof. The preparation method comprises the following steps of using kaolin, aluminum oxide and industrial aluminum sol as the raw materials, using a mineralizing agent and a sintering additive as the auxiliary materials, adding a perforating agent, and performing glue discharge and sintering technology, so as to prepare a mullite porous ceramic with high porosity; using ethyl silicate and siloxane monomer as the raw materials to prepare a siliconoxide sol, enabling the silicon oxide sol to permeate into the mullite porous ceramic, drying at normal temperature, cracking under the inert atmosphere, then permeating into the aluminum sol, drying,and decarbonizing in the high-temperature air, so as to obtain the high temperature-resistant, heat-insulation and wave-permeable ceramic-based composite material. The high temperature-resistant, heat-insulation and wave-permeable ceramic-based composite material has the beneficial effects that the raw materials are reasonably selected, so as to complete the low-temperature preparation of the porous mullite, and decrease the production energy consumption while the cost of the raw material is reduced; the drying technology of the aerogel is simplified, and the preparation cycle is shortened; the characteristics of low density, high temperature-resistant property and low heat conductivity are realized; the excellent wave-permeable property is realized.

Description

technical field [0001] The invention relates to the technical field of preparation of ceramic composite materials, in particular to a preparation method of a high-temperature-resistant, heat-insulating and wave-transmitting ceramic-based composite material. Background technique [0002] In the field of military defense, as the speed of the aircraft increases significantly, it is faced with serious aerodynamic heating, resulting in a temperature of up to 1200°C in the front section of the aircraft or the leading edge of the wing. A composite material with high temperature resistance, light weight, low thermal conductivity and wave transparency is prepared. The currently used quartz or nitride ceramics face problems such as low operating temperature or high-temperature oxidation resistance. At the same time, in order to reduce the thermal conductivity of the material, porous wave-transparent materials or braids are often combined with silica airgel. To achieve the purpose of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/185C04B38/06C04B41/89
CPCC04B35/185C04B38/067C04B38/068C04B41/009C04B41/52C04B41/89C04B2235/3217C04B2235/3218C04B2235/349C04B2235/445C04B2235/5436C04B2235/5445C04B2235/5454C04B2235/602C04B2235/656C04B2235/6562C04B2235/6567C04B2235/6583C04B2235/9607C04B41/5035C04B41/4537C04B41/0072C04B41/5031
Inventor 叶枫马杰刘强张标高晔叶健
Owner HARBIN INST OF TECH
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